High frequency limit of the Transport Cross Section and boundedness of the Total Cross Section in scattering by an obstacle with impedance boundary conditions

The scalar scattering of the plane wave by a strictly convex obstacle with impedance boundary conditions is considered. The uniform boundedness of the Total Cross Section for all values of frequencies is proved. The high frequency limit of the Transport Cross Section is founded and presented as a classical functional of the variational theory

Spectral properties of the Dirichlet-to-Neumann operator for exterior Helmholtz problem and its applications to scattering theory

We prove that the Dirichlet-to-Neumann operator (DtN) has no spectrum in the lower half of the complex plane. We find several application of this fact in scattering by obstacles with impedance boundary conditions. In particular, we find an upper bound for the gradient of the scattering amplitude and for the total cross section. We justify numerical approximations by providing bounds on difference between theoretical and approximated solutions without using any a priory unknown constants

Resonance regimes of scattering by small bodies with impedance boundary conditions

The paper concerns scattering of plane waves by a bounded obstacle with complex valued impedance boundary conditions. We study the spectrum of the Neumann-to-Dirichlet operator for small wave numbers and long wave asymptotic behavior of the solutions of the scattering problem. The study includes the case when $k=0$ is an eigenvalue or a resonance. The transformation from the impedance to the Dirichlet boundary condition as impedance grows is described. A relation between poles and zeroes of the scattering matrix in the non-self adjoint case is established. The results are applied to a problem of scattering by an obstacle with a springy coating. The paper describes the dependence of the impedance on the properties of the material, that is on forces due to the deviation of the boundary of the obstacle from the equilibrium position

ПРЕДМЕТНАЯ КОМПЕТЕНТНОСТЬ В СИСТЕМЕ МНОГОУРОВНЕВОГО ВЫСШЕГО ЭКОНОМИЧЕСКОГО ОБРАЗОВАНИЯ

The article discusses the issue of building subject competence of students in multilevel higher economic education system settings. The authors reveal the factors dictating the need for content implementation of competence-based approach through training subject. The paper explains the expediency of the idea of advanced training in terms of the leading position of competence-based approach in the multi-paradigmatic modern educational environment. It describes the experience of the Financial University under the Government of the Russian Federation in developing and implementing an educational standard for teaching “Economics” based on the disciplines included in the subject “Mathematics”, it shows the possibility of designing the educational process taking into account the perceived importance of individual competences. It shows the results of a sociological survey of regional employers requirements in order to specify learning outcomes as a cluster of generated competencies.В статье обсуждается проблема формирования предметной компетентности студентов в условиях многоуровневого высшего экономического образования. Выделены факторы, обусловливающие необходимость содержательной реализации компетентностного подхода средствами предметной подготовки. Обоснована целесообразность идеи опережающего обучения с точки зрения ведущей позиции компетентностного подхода в условиях полипарадигмальности современного образовательного пространства. Представлен опыт Финансового университета при Правительстве РФ в разработке и внедрении в практику обучения Образовательного стандарта высшего образования по направлению «Экономика», определяющего возможность проектирования образовательного процесса в соответствии с «весовым коэффициентом» важности отдельных компетенций на примере дисциплин предметной области «Математика». Продемонстрированы результаты социологического исследования требований региональных работодателей с целью конкретизации результатов образования в виде кластера формируемых компетенций

Fluorescent Discrimination between Traces of Chemical Warfare Agents and Their Mimics

An array of fluorogenic probes is able to discriminate between nerve agents, sarin, soman, tabun, VX and their mimics, in water or organic solvent, by qualitative fluorescence patterns and quantitative multivariate analysis, thus making the system suitable for the inthe- field detection of traces of chemical warfare agents as well as to differentiate between the real nerve agents and other related compounds.Ministerio de Economía y Competitividad, Spain (Project CTQ2012- 31611), Junta de Castilla y León, Consejería de Educación y Cultura y Fondo Social Europeo (Project BU246A12-1), the European Commission, Seventh Framework Programme (Project SNIFFER FP7-SEC-2012-312411) and the Swedish Ministry of Defence (no. A403913

Identification of a mitotic recombination hotspot on chromosome III of the asexual fungus Aspergillus niger and its possible correlation elevated basal transcription

Genetic recombination is an important tool in strain breeding in many organisms. We studied the possibilities of mitotic recombination in strain breeding of the asexual fungus Aspergillus niger. By identifying genes that complemented mapped auxotrophic mutations, the physical map was compared to the genetic map of chromosome III using the genome sequence. In a program to construct a chromosome III-specific marker strain by selecting mitotic crossing-over in diploids, a mitotic recombination hotspot was identified. Analysis of the mitotic recombination hotspot revealed some physical features, elevated basal transcription and a possible correlation with purine stretches

Quantitative Trait Locus (QTL) Mapping Reveals a Role for Unstudied Genes in Aspergillus Virulence

Infections caused by the fungus Aspergillus are a major cause of morbidity and mortality in immunocompromised populations. To identify genes required for virulence that could be used as targets for novel treatments, we mapped quantitative trait loci (QTL) affecting virulence in the progeny of a cross between two strains of A. nidulans (FGSC strains A4 and A91). We genotyped 61 progeny at 739 single nucleotide polymorphisms (SNP) spread throughout the genome, and constructed a linkage map that was largely consistent with the genomic sequence, with the exception of one potential inversion of ∼527 kb on Chromosome V. The estimated genome size was 3705 cM and the average intermarker spacing was 5.0 cM. The average ratio of physical distance to genetic distance was 8.1 kb/cM, which is similar to previous estimates, and variation in recombination rate was significantly positively correlated with GC content, a pattern seen in other taxa. To map QTL affecting virulence, we measured the ability of each progeny strain to kill model hosts, larvae of the wax moth Galleria mellonella. We detected three QTL affecting in vivo virulence that were distinct from QTL affecting in vitro growth, and mapped the virulence QTL to regions containing 7–24 genes, excluding genes with no sequence variation between the parental strains and genes with only synonymous SNPs. None of the genes in our QTL target regions have been previously associated with virulence in Aspergillus, and almost half of these genes are currently annotated as “hypothetical”. This study is the first to map QTL affecting the virulence of a fungal pathogen in an animal host, and our results illustrate the power of this approach to identify a short list of unknown genes for further investigation

BUILDING SUBJECT СOMPETENCE IN MULTILEVEL HIGHER ECONOMIC EDUCATION SYSTEM SETTINGS

The article discusses the issue of building subject competence of students in multilevel higher economic education system settings. The authors reveal the factors dictating the need for content implementation of competence-based approach through training subject. The paper explains the expediency of the idea of advanced training in terms of the leading position of competence-based approach in the multi-paradigmatic modern educational environment. It describes the experience of the Financial University under the Government of the Russian Federation in developing and implementing an educational standard for teaching “Economics” based on the disciplines included in the subject “Mathematics”, it shows the possibility of designing the educational process taking into account the perceived importance of individual competences. It shows the results of a sociological survey of regional employers requirements in order to specify learning outcomes as a cluster of generated competencies